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Although data from NASA's MESSENGER space mission steadily advances knowledge of Mercury, the innermost of the eight planets in the solar system, I report a humbling clinical experience from its terrestrial representative.
A man was referred because his general physician thought that he had Parkinson's disease. His complaint, given rather reluctantly and in an irritable manner, was ‘shaking’. He had a fine rapid tremor at rest and during action, affecting his head, face and limbs. …
Competing interest None.
Provenance and peer review Not commissioned; externally peer reviewed.